The radiation amount of a mobile phone for two half-hour periods per day is equal to ______ to an X-ray for ten seconds.
A.expose | B.exposing | C.exposed | D.being exposed |
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The radiation amount of a mobile phone for two half-hour periods per day is equal to ______ to an X-ray for ten seconds.
A.expose | B.exposing | C.exposed | D.being exposed |